ELEOPTION(TM) Rechargable Cordless Phone Replacemnt Battery of MD481, MD491, MA500, MA550, MA551, MA560, MA561, MA580, MA581, MD550, MD670, MD70, MD71, MD700, MD750, MD751, MD760, MD761, MD781, MD791, MD7001, MD7081, MD7091, MD481SYS, MD451S 100% OEM Compatible - Complies with or Exceeds OEM Panasonic P-P511 Battery specs Guaranteed to operate with your Panasonic P-P511 cordless phone CE Safety Certification Warranted for 12 months Works with multiple models, listed below - Use CTRL+F to find your model